Apologies if this has been asked before, I have searched the forums and google but not found the specific answer for the N5100. There are so many warnings about flashing a custom ROM without an unlocked bootloader and how it will brick your device that I haven't flashed one yet. My question is, is it absolutely necessary to unlock the bootloader and if so, how can I do it? There are no links to N5100 specific tools to unlock it and I can't find a way using any of the toolkits or utilities. There are custom ROMs available for the N5100 so people must be flashing them, right? If so, how did they unlock their bootloaders?